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I've seen rulers that attach to computer monitors that slide up and down. They are extremely useful for reading documents on your PC. Does anyone know where I can get them?

3M - Monitor Mount Document Holder
Six-way, infinite adjustability ensures comfortable, ergonomically correct viewing. Space-saving design attaches to either side of computer and swings out of sight when not in use. Standard-sized document holder is built tough. Adjusts smoothly and evenly.

You might want to check outDKRuler - Desktop Ruler 3.11 Keep your position on screen when reading and working with documents. Align & organize text, graphics and other objects on http://www.screen.It is shareware (free) CLICK HERE TO DOWNLOAD